import { NodePgDatabase } from "drizzle-orm/node-postgres";
import type { Request, Response } from "express";
import { updates } from "../db/schema.js";
import { desc, eq } from "drizzle-orm";
import fs from "node:fs/promises";

const nonceChars =
  "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890-_";
let nonce: string;
export function setNonce() {
  nonce = "";
  for (let i = 0; i < 32; i++)
    nonce += nonceChars[Math.floor(Math.random() * nonceChars.length)];
  return nonce;
}
export function getNonce() {
  if (!nonce)
    throw new Error("Nonce doesn't exist");
  return nonce;
}

let moods: string[], moodsSorted: string[];
export async function getMoods() {
  if (!moods)
    moods = (await fs.readFile("./static/moods.txt"))
      .toString("utf-8")
      .split(";");
  if (!moodsSorted) moodsSorted = Array.from(moods).sort();
  return { moods, moodsSorted };
}

export async function render(
  db: NodePgDatabase,
  page: string,
  title: string,
  res: Response,
  req: Request,
  stuff?: Object
) {
  //? maybe you should cache this and save the current mood to the session until it's changed
  const { moods } = await getMoods();
  let currentMood: string;
  if (req.session["loggedIn"]) {
    const update = (
      await db
        .select({ mood: updates.mood })
        .from(updates)
        .where(eq(updates.user, req.session["uid"]))
        .orderBy(desc(updates.date))
        .limit(1)
    )[0];
    currentMood = moods[update?.mood];
  }

  const o = {
    title,
    session: req.session,
    flashes: req.flash(),
    moods,
    currentMood,
    nonce
  };
  res.render(page, { ...o, ...stuff });
}